Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual classe não preservou e fez 2?
 ###Tabelas: CREATE TABLE texas (texas_id AUTO_INCREMENT PRIMARY KEY, District VARCHAR, Incumbent VARCHAR, Party VARCHAR, First elected INT, Results VARCHAR, Candidates VARCHAR) CREATE TABLE class_f:_2-8-0 (class_f:_2-8-0_id AUTO_INCREMENT PRIMARY KEY, Class VARCHAR, Wheel arrangement VARCHAR, Fleet number(s) VARCHAR, Manufacturer VARCHAR, Year made VARCHAR, Quantity made VARCHAR, Quantity preserved VARCHAR) CREATE TABLE apollo_astronauts_who_flew_to_the_moon_without_landing (apollo_astronauts_who_flew_to_the_moon_without_landing_id AUTO_INCREMENT PRIMARY KEY, Name VARCHAR, Born VARCHAR, Age on mission INT, Mission VARCHAR, Mission dates VARCHAR, Service VARCHAR) CREATE TABLE former_judges (former_judges_id AUTO_INCREMENT PRIMARY KEY, Judge VARCHAR, State VARCHAR, Born/Died VARCHAR, Active service VARCHAR, Chief Judge VARCHAR, Senior status VARCHAR, Appointed by VARCHAR, Reason for termination VARCHAR) CREATE TABLE season-by-season (season-by-season_id AUTO_INCREMENT PRIMARY KEY, Season VARCHAR, Division VARCHAR, Finish VARCHAR, Wins VARCHAR, Losses VARCHAR, Pct. VARCHAR)  
SELECT Class FROM class_f:_2-8-0 WHERE Quantity preserved = 0 AND Quantity made = 2